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The jetty core handler adapted to legacy ee8 handler.
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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.ee8.nested;

import java.io.IOException;
import javax.servlet.AsyncEvent;
import javax.servlet.AsyncListener;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Handler to adjust the idle timeout of requests while dispatched.
 * Can be applied in jetty.xml with
 *  *   <Get id='handler' name='Handler'/>
 *   <Set name='Handler'>
 *     <New id='idleTimeoutHandler' class='org.eclipse.jetty.server.handler.IdleTimeoutHandler'>
 *       <Set name='Handler'><Ref id='handler'/></Set>
 *       <Set name='IdleTimeoutMs'>5000</Set>
 *     </New>
 *   </Set>
 * 
 */
public class IdleTimeoutHandler extends HandlerWrapper {

    private long _idleTimeoutMs = 1000;

    private boolean _applyToAsync = false;

    public boolean isApplyToAsync() {
        return _applyToAsync;
    }

    /**
     * Should the adjusted idle time be maintained for asynchronous requests
     *
     * @param applyToAsync true if alternate idle timeout is applied to asynchronous requests
     */
    public void setApplyToAsync(boolean applyToAsync) {
        _applyToAsync = applyToAsync;
    }

    public long getIdleTimeoutMs() {
        return _idleTimeoutMs;
    }

    /**
     * @param idleTimeoutMs The idle timeout in MS to apply while dispatched or async
     */
    public void setIdleTimeoutMs(long idleTimeoutMs) {
        this._idleTimeoutMs = idleTimeoutMs;
    }

    @Override
    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
        final HttpChannel channel = baseRequest.getHttpChannel();
        final long idle_timeout = baseRequest.getHttpChannel().getIdleTimeout();
        channel.setIdleTimeout(_idleTimeoutMs);
        try {
            super.handle(target, baseRequest, request, response);
        } finally {
            if (_applyToAsync && request.isAsyncStarted()) {
                request.getAsyncContext().addListener(new AsyncListener() {

                    @Override
                    public void onTimeout(AsyncEvent event) throws IOException {
                    }

                    @Override
                    public void onStartAsync(AsyncEvent event) throws IOException {
                    }

                    @Override
                    public void onError(AsyncEvent event) throws IOException {
                        channel.setIdleTimeout(idle_timeout);
                    }

                    @Override
                    public void onComplete(AsyncEvent event) throws IOException {
                        channel.setIdleTimeout(idle_timeout);
                    }
                });
            } else
                channel.setIdleTimeout(idle_timeout);
        }
    }
}